Buggy code:
public class ZTable { private static double [ ] zTable = new double [ ] { 0.5 , 0.504 , 0.508 , 0.512 , 0.516 , 0.5199 , 0.5239 , 0.5279 , 0.5319 , 0.5359 , 0.5398 , 0.5438 , 0.5478 , 0.5517 , 0.5557 , 0.5596 , 0.5636 , 0.5675 , 0.5714 , 0.5753 , 0.5793 , 0.5832 , 0.5871 , 0.591 , 0.5948 , 0.5987 , 0.6026 , 0.6064 , 0.6103 , 0.6141 , 0.6179 , 0.6217 , 0.6255 , 0.6293 , 0.6331 , 0.6368 , 0.6406 , 0.6443 , 0.648 , 0.6517 , 0.6554 , 0.6591 , 0.6628 , 0.6664 , 0.67 , 0.6736 , 0.6772 , 0.6808 , 0.6844 , 0.6879 , 0.6915 , 0.695 , 0.6985 , 0.7019 , 0.7054 , 0.7088 , 0.7123 , 0.7157 , 0.719 , 0.7224 , 0.7257 , 0.7291 , 0.7324 , 0.7357 , 0.7389 , 0.7422 , 0.7454 , 0.7486 , 0.7517 , 0.7549 , 0.758 , 0.7611 , 0.7642 , 0.7673 , 0.7704 , 0.7734 , 0.7764 , 0.7794 , 0.7823 , 0.7852 , 0.7881 , 0.791 , 0.7939 , 0.7967 , 0.7995 , 0.8023 , 0.8051 , 0.8078 , 0.8106 , 0.8133 , 0.8159 , 0.8186 , 0.8212 , 0.8238 , 0.8264 , 0.8289 , 0.8315 , 0.834 , 0.8365 , 0.8389 , 0.8413 , 0.8438 , 0.8461 , 0.8485 , 0.8508 , 0.8531 , 0.8554 , 0.8577 , 0.8599 , 0.8621 , 0.8643 , 0.8665 , 0.8686 , 0.8708 , 0.8729 , 0.8749 , 0.877 , 0.879 , 0.881 , 0.883 , 0.8849 , 0.8869 , 0.8888 , 0.8907 , 0.8925 , 0.8944 , 0.8962 , 0.898 , 0.8997 , 0.9015 , 0.9032 , 0.9049 , 0.9066 , 0.9082 , 0.9099 , 0.9115 , 0.9131 , 0.9147 , 0.9162 , 0.9177 , 0.9192 , 0.9207 , 0.9222 , 0.9236 , 0.9251 , 0.9265 , 0.9279 , 0.9292 , 0.9306 , 0.9319 , 0.9332 , 0.9345 , 0.9357 , 0.937 , 0.9382 , 0.9394 , 0.9406 , 0.9418 , 0.9429 , 0.9441 , 0.9452 , 0.9463 , 0.9474 , 0.9484 , 0.9495 , 0.9505 , 0.9515 , 0.9525 , 0.9535 , 0.9545 , 0.9554 , 0.9564 , 0.9573 , 0.9582 , 0.9591 , 0.9599 , 0.9608 , 0.9616 , 0.9625 , 0.9633 , 0.9641 , 0.9649 , 0.9656 , 0.9664 , 0.9671 , 0.9678 , 0.9686 , 0.9693 , 0.9699 , 0.9706 , 0.9713 , 0.9719 , 0.9726 , 0.9732 , 0.9738 , 0.9744 , 0.975 , 0.9756 , 0.9761 , 0.9767 , 0.9772 , 0.9778 , 0.9783 , 0.9788 , 0.9793 , 0.9798 , 0.9803 , 0.9808 , 0.9812 , 0.9817 , 0.9821 , 0.9826 , 0.983 , 0.9834 , 0.9838 , 0.9842 , 0.9846 , 0.985 , 0.9854 , 0.9857 , 0.9861 , 0.9864 , 0.9868 , 0.9871 , 0.9875 , 0.9878 , 0.9881 , 0.9884 , 0.9887 , 0.989 , 0.9893 , 0.9896 , 0.9898 , 0.9901 , 0.9904 , 0.9906 , 0.9909 , 0.9911 , 0.9913 , 0.9916 , 0.9918 , 0.992 , 0.9922 , 0.9925 , 0.9927 , 0.9929 , 0.9931 , 0.9932 , 0.9934 , 0.9936 , 0.9938 , 0.994 , 0.9941 , 0.9943 , 0.9945 , 0.9946 , 0.9948 , 0.9949 , 0.9951 , 0.9952 , 0.9953 , 0.9955 , 0.9956 , 0.9957 , 0.9959 , 0.996 , 0.9961 , 0.9962 , 0.9963 , 0.9964 , 0.9965 , 0.9966 , 0.9967 , 0.9968 , 0.9969 , 0.997 , 0.9971 , 0.9972 , 0.9973 , 0.9974 , 0.9974 , 0.9975 , 0.9976 , 0.9977 , 0.9977 , 0.9978 , 0.9979 , 0.9979 , 0.998 , 0.9981 , 0.9981 , 0.9982 , 0.9982 , 0.9983 , 0.9984 , 0.9984 , 0.9985 , 0.9985 , 0.9986 , 0.9986 , 0.9987 , 0.9987 , 0.9987 , 0.9988 , 0.9988 , 0.9989 , 0.9989 , 0.9989 , 0.999 , 0.999 } ; public static double getProbabilityFromZ ( double z ) { } public static double getDeviationFromCenter ( double z ) { if ( z < 0 ) z = - z ; if ( z >= 3.09 ) return 0.0 ; <START_BUG> return 1 - ( 2.0 * ( ZTable . zTable [ ( ( int ) ( Math . round ( ( z * 100.0 ) ) ) ) ] ) ) ; <END_BUG> } }

Fix:
return 1 - ( 2.0 * ( ( ZTable . zTable [ ( ( int ) ( Math . round ( ( z * 100.0 ) ) ) ) ] ) - 0.5 ) ) ;